Somehow the header in my guestbook got corrupted and now just sends me a bunch of errors like these.
Deprecated: Function ereg() is deprecated in /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/mysql.class.php on line 21

Warning: Cannot modify header information - headers already sent by (output started at /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/mysql.class.php:21) in /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/admin.class.php on line 33

Warning: Cannot modify header information - headers already sent by (output started at /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/mysql.class.php:21) in /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/admin.class.php on line 34

Warning: Cannot modify header information - headers already sent by (output started at /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/mysql.class.php:21) in /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/admin.class.php on line 35

Warning: Cannot modify header information - headers already sent by (output started at /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/mysql.class.php:21) in /home/content/a/m/m/ammo6/html/back2thebeach/guestbook/lib/admin.class.php on line 36

Try updating to 2.4.4. just download it, extract the contents, delete config.inc.php from it's administration folder. Now backup your existing files and then replace the files on the server with the new files.